lgtm: fix alerts

packages/ui-default/build/main.js

@@ -71,7 +71,7 @@ async function runGulp() {
 async function main() {
   const dir = process.cwd();
   process.chdir(root());
-  await runGulp({});
+  await runGulp();
   await runWebpack(argv);
   process.chdir(dir);
 }

packages/ui-default/pages/problem_edit.page.js

@@ -62,7 +62,7 @@ function parseCategorySelection() {
     else if (!subcategory) {
       categories[category].select = true;
       dirtyCategories.push({ type: 'category', category });
-    } else if (category) {
+    } else {
       categories[category].children[subcategory].select = true;
       dirtyCategories.push({ type: 'subcategory', subcategory, category });
     }

packages/ui-default/tool/checkTranslation.js

@@ -25,8 +25,8 @@ function _(str, format) {
   if (!texts[str]) texts[str] = [currentFile];
   else texts[str].push(currentFile);
 }
-const i18n = _;
-const Setting = _;
+const i18n = _; // lgtm [js/unused-local-variable]
+const Setting = _; // lgtm [js/unused-local-variable]
 
 function scanTemplate(folder, relative = 'templates') {
   const files = fs.readdirSync(folder);